Time-alarm



(No Model.)

J. POMEROY & J. WINSLOW, Jr.

TIME ALARM.

No. 259,584. Patented June 13, 1882.

UNITED STATES PATENT OFFICE.

JOHN POMEROY AND JOHN \VINSLOXV, JR, OF BRISTOL, CONNECTICUT.

TIME-ALARM.

SPECIFICATION forming part of Letters Patent No. 259,584, dated June 18,1882.

Application filed August 15, 1881.

To all whom it may concern:

Be it known that we, JoHN POMEROY and JOHN WINSLOW, J r., of Bristol, inthe county of Hartford and State of Connecticut, haveinvented certainnew and useful Improvements in Alarm-Clocks, of which the following is aspecification.

Our invention relates to improvements in alarm mechanism for eightdayclocks, in which a twenty-four-hour wheel acts upon lock-work to let offthe alarm every morning and to stop it again after a given time; also inwhich there is an adjustable stop for acting upon the hammer to preventsounding the alarm at such times as may be desired; and the objects ofour improvements are to provide an alarm that requires winding but oncea week, and which, if desired, may be prevented from being sounded uponany day; also, to so simplify the construction that the mechanism willnot be liable to get out of order, and may be constructed at a smallcost. We attain these objects by the mechanism illustrated in theaccompanying drawings, in which- Figure l is a front elevation with thefront plate removed. Fig. 2 is a plan view, and Fig. 3 a frontelevation.

The hammer-shaft A, its pallets a a, the escapementwheel B, main wheelC, with its spring, ratchet, and pawl, may be of any ordinaryconstruction. The spring however should be of such length as to impartto the main shaft D the desired number of turns for sounding the alarmevery day for a week, so that the alarm will require winding only whenit is necessary to wind the clock.

By the side of the main wheel C, and so connected thereto as to revolvewith it, we place a smooth-edged disk, E, having a notch, Zr, in itsperiphery.

In the alarm-movement plates we pivot a lock-work shaft, F, bearing twohooked arms, 0 d, the former of which bears upon the periphery of thedisk E and the latter of which extends along by the side of theescapementwheel B, so as to engage the pin 6, mounted on said wheel. Asecond lock-work shaft, G, is also pivoted in the alarm-movement plates,and bears a hooked arm,]", which extends under the arm d for lifting itat the proper time, and another arm, g, for engaging the pin 0.

(No model.)

This lockwork shalt G is also provided with a lever, h, which extendsupward to the clockmovement and engages a pin, k, on a twentyfour-hourwheel, H.

We have not shown the clock-movement nor the alarm-dial, as the same arewell known. Any suitable dial for setting the twenty-fourliour pin-wheelH so that the pin 70 will release its hold upon the lever h at anydesired hour may be employed, and the same may be done by ordinarygearwheels, so that the wheel H will revolve once in every twentyfourhours. In setting the alarm the position of the pin It should beobserved, so that it will release the lever not only at the desiredhour, but at that hour in the desired part of the day, which isgenerally in the morning. This wheel moves in the direction indicated bythe dart near the wheel H in Fig. 1.

The lock-work shaft G should be provided with a suitable stop to limitthe extent of its backward movement, so that it will be caught by thepin k. 111 the drawings this stop is formed by the lever m, attached tothe shaft G, and the stop-pin n on the rear plate of the alarm movement.WVhen the notch b in the periphery of the disk E comes under the end ofthe hooked arm 0 the armsc d both fall so far as to bring the end ofthearm (1 into the path of the pin 6 on the escapementwheel and stopsaid wheel by contact with said pin, all as shown in Fig. "1. ThetwentyA'our-hour wheel is represented in the drawings as just about totake up the lever h. As said wheel moves on and the lever is moved withit the armf lifts the arms 0 (I out ofthe notch b and out of engagementwith the pins 0, thereby leaving the wheels free to be moved under theinfluence of the spring for a moment until the pin 0 is caught by thearm g, said arm being brought into the path ofsaid pin by the forwardmove ment of the lever h. Upon the release of the lever h by the pin Inon the twenty-four-hour wheel the lever returns to its former positionand the arm (I. is lifted out of the path of the pin 6 by means of theincline on the forward side of the notch in the disk E acting upon thearm 0, while the uncut portion of the periphery holds said arms elevatedso that the wheels revolve to sound the alarm until the notch 1) comesunder the end of arm 0 and the arms 0 and d again falland stop thealarm. The parts are then ready for a repetition of the operation uponthe following day, and so on for every day until the alarm is run downor purposely prevented from operating. As shown, the alarm will soundduring the time that the main shaft is making one complete revolution.The train may be such that this one revolution of the main shaft willoperate the hammer-wire o fora longer or shorter time by changing therelative size of the gears; or two or more notches may be made in theperiphery of the disk, in which case the main shaft would make less thanone revolution at each daily operation.

In Figs. 2 and 3 we have illustrated an adjustable stop for locking thehammer-wire 0 in place, so that the pallets a acaunot escape the teethof the escapement-wheel, and thereby the alarm may be prevented fromsounding upon any day, or for so long a time as may be desired. Thisconsists of a simple slide, r, placed in a slotted extension, 8, of theframe, and so mounted therein as to stay in whatever position it may beplaced within the slot. When this slide is in the position illustratedin the drawings the hammer-wireo is free to operate; but when it iscrowded downward it binds snugly upon the wire and prevents itsoperation, although otherwise the parts will be in condition to operate.When this stop is not brought into position to hold the hammer-wire thehammer is perfectly free at all times, and in this respect it differsfrom the ordinary alarm, in which the escapement-wheel is held byconfining the hammer-shaftso that the pal- 3 5 lets cannot escape theteeth of the wheel. The construction of our alarm is such that it iswholly disconnected from the clock, (except for a few hours out of thetwenty-four,) so that no friction whatever is brought to bear on theclock-train, whereas other alarms generally haveadevice which bears uponthe edge ofacam attached to the time-train with all the force of thealarm-spring, which is continually pressing upon the escapement-wheel toforce the pallets to escape.

We claim as our invention- 1. In an alarm-movement, the combination ofthe main wheel, smooth-edge disk having a notch in its periphery, theescapement-wheel bearing pin 0, the lockwork shaft bearing arms 0 d, andmechanism for tripping said arms once in twenty-four hours,substantially as described, and for the purpose specified.

2. The combination of the main wheel 0, disk E, escapementwheel B, pin0, lock-work shal'ts F 0 at G fg, lever h, and twenty-fourhour pinwheel, substantially as described, and for the purpose specified.

3. In an alarm for an eight-day clock, the adjustable stop for actingupon the hammerwire and holding the pallets from escaping when desired,substantially as described.

JOHN POMEROY. JOHN WIN SLOW, JR. Witnesses:

H. BEOKWITH, O. M. BECKWITH.

